... thick-walled pipe High-quality products Square And Rectangular Steel Pipe Production Process Executable standards: GB / T6728-2002, GB ... or technical agreement Material: Q195-Q235, Q345, 20 #, alloy steel, ST37-2, ST52-3, S235, S355etc Product packaging: painting ... railways, highway guardrail, container skeleton, furniture, decoration and steel structure. Lsaw Steel Pipe workshop Production Process